cents and children resortad in Tables 11, 12 and 13 were computed using efficiencies obtained from standard adolescent and juvenile Bomab phantoms. . Table 13 summarizes the 137 . Cs data that are presently available. . It shows the mean standard deviation from the mean, and range of values reported for the sampled population segregated by sex and age, as it has changed from 1974 to 1980. Table 14 compares the observed reduction in 13765 body burdens from April 1978 to January 1979 with the reduction in 1376, body burden that was expected as a result of relocating the Bikini population in late August 1978. Values for the siological removal rate constants were obtained from NCRP Report 52 (NRCP 77) and ICRP Publication 10A (ICRP 71). Table 15 presents the long term biological removal rate constants for individuals in the Bikini population as determined from sequential measurements in 1979 and 1980. Table 16 presents population subgroup mean values for the 1376, long term biological removal rate constant. The data are in good agreement with ICRP publication 10A (ICRP 71) and NCRP report 52 (NCRP 77). In addition to the followup whole body counts performed on persons who were initially counted in April 1978 on Bikini Atoll, persons who had resided at Bixini Atoll and were concerned about their current body burdens were counted. Dependents of adult Bikini Atoll residents were counted regardless of their residence history. Results of this work conducted in January 1979, May 1979 and August 1980 at Majuro Atoll, Kili Island and Jaluit Atoll are presented for adult males, adult females, adolescents and juveniles in Tables 17 through 20 re- Spectively. Most of the 13765 body burdens are at levels which are consistent with world fallout contamination. 13765 body burdens. Some dividuals have higher than anticipated Interviews with these subjects revealed that they either 10